text: //===- OpInterfaces.cpp - OpInterfaces class ------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // OpInterfaces wrapper to simplify using TableGen OpInterfaces.
  //
  //===----------------------------------------------------------------------===//
  
  #include "mlir/TableGen/OpInterfaces.h"
  #include "llvm/ADT/StringExtras.h"
  #include "llvm/Support/FormatVariadic.h"
  #include "llvm/TableGen/Error.h"
  #include "llvm/TableGen/Record.h"
  
  using namespace mlir;
  using namespace mlir::tblgen;
  
  OpInterfaceMethod::OpInterfaceMethod(const llvm::Record *def) : def(def) {
    llvm::DagInit *args = def->getValueAsDag("arguments");
    for (unsigned i = 0, e = args->getNumArgs(); i != e; ++i) {
      arguments.push_back(
          {llvm::cast<llvm::StringInit>(args->getArg(i))->getValue(),
           args->getArgNameStr(i)});
    }
  }
  
  StringRef OpInterfaceMethod::getReturnType() const {
    return def->getValueAsString("returnType");
  }
  
  // Return the name of this method.
  StringRef OpInterfaceMethod::getName() const {
    return def->getValueAsString("name");
  }
  
  // Return if this method is static.
  bool OpInterfaceMethod::isStatic() const {
    return def->isSubClassOf("StaticInterfaceMethod");
  }
  
  // Return the body for this method if it has one.
  llvm::Optional<StringRef> OpInterfaceMethod::getBody() const {
    auto value = def->getValueAsString("body");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  
  // Return the default implementation for this method if it has one.
  llvm::Optional<StringRef> OpInterfaceMethod::getDefaultImplementation() const {
    auto value = def->getValueAsString("defaultBody");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  
  // Return the description of this method if it has one.
  llvm::Optional<StringRef> OpInterfaceMethod::getDescription() const {
    auto value = def->getValueAsString("description");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  
  ArrayRef<OpInterfaceMethod::Argument> OpInterfaceMethod::getArguments() const {
    return arguments;
  }
  
  bool OpInterfaceMethod::arg_empty() const { return arguments.empty(); }
  
  OpInterface::OpInterface(const llvm::Record *def) : def(def) {
    auto *listInit = dyn_cast<llvm::ListInit>(def->getValueInit("methods"));
    for (llvm::Init *init : listInit->getValues())
      methods.emplace_back(cast<llvm::DefInit>(init)->getDef());
  }
  
  // Return the name of this interface.
  StringRef OpInterface::getName() const {
    return def->getValueAsString("cppClassName");
  }
  
  // Return the methods of this interface.
  ArrayRef<OpInterfaceMethod> OpInterface::getMethods() const { return methods; }
  
  // Return the description of this method if it has one.
  llvm::Optional<StringRef> OpInterface::getDescription() const {
    auto value = def->getValueAsString("description");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  
  // Return the interfaces extra class declaration code.
  llvm::Optional<StringRef> OpInterface::getExtraClassDeclaration() const {
    auto value = def->getValueAsString("extraClassDeclaration");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  
  // Return the traits extra class declaration code.
  llvm::Optional<StringRef> OpInterface::getExtraTraitClassDeclaration() const {
    auto value = def->getValueAsString("extraTraitClassDeclaration");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  
  // Return the body for this method if it has one.
  llvm::Optional<StringRef> OpInterface::getVerify() const {
    auto value = def->getValueAsString("verify");
    return value.empty() ? llvm::Optional<StringRef>() : value;
  }
  